To interchange the administrative jurisdiction of certain Federal lands between the Forest Service and the Bureau of Land Management, and for other purposes.

Transfers, on the enactment of this Act, the administrative jurisdiction of specified federally owned lands in the Shasta-Trinity National Forest in California from the Secretary of Agriculture to the Secretary of the Interior. Subjects such lands to the laws, rules, and regulations applicable to the public lands administered by the Bureau of Land Management (BLM). Excepts lands within the Shasta Dam Reclamation Zone from such transfer and continues the administration of those lands by the Secretary of the Interior through the Bureau of Reclamation.

Transfers, on this Act's enactment, the administrative jurisdiction of specified federally owned lands in California administered by the BLM from the Secretary of the Interior to the Secretary of Agriculture. Subjects the lands to the laws, rules, and regulations applicable to the National Forest System. Withdraws such lands from the public domain and reserves them for administration as part of the Shasta-Trinity National Forest.

Prohibitsthe transfer of administrative jurisdiction from the BLM to the Forest Service of certain lands previously designated as part of the Trinity Alps Wilderness from affecting the wilderness status of those lands.

Prohibits anything in this Act from affecting any valid existing rights, or affecting the validity or term and conditions of any existing withdrawal, right-of-way, easement, lease, license, or permit on the transferred lands, except that any such authorization shall be administered by the agency having jurisdiction of the land after this Act's enactment in accordance with applicable law. Requires the reissuance of any such authorization to be in accordance with the applicable law and regulations of the agency having jurisdiction.

Requires the Forest Service and the BLM, with respect to the transfer of their lands, to identify any known sites concerning hazardous substances and to provide such information to the receiving agency. Makes the clean up of hazardous substances on lands transferred by this Act the responsibility of the agency having jurisdiction over them on the day before this Act's enactment.